IRAUDAMP4 Datasheet, PDF (21/44 Pages) International Rectifier – 120 W x 2 Channel Class D Audio Power Amplifier

Thermal Considerations
The daughter board design can handle one-eighth of the continuous rated power, which
is generally considered to be a normal operating condition for safety standards. Without
the addition of a heatsink or forced air-cooling, the daughter board cannot handle
continuous rated power.
100.0%
90.0%
80.0%
70.0%
60.0%
50.0%
40.0%
30.0%
20.0%
10.0%
0.0%
0
20
40
60
80
100
120
140
160
180
Output Power (W)
Figure 16. Efficiency FV. Output Power, 4 Ω Single Channel Driven, ±B supply = ±35 V, 1 kHz
Audio Signal
67°C
54°C
Figure 17. Thermal image of Daughter Board
Two-Channel x 1/8th Rated Power (15 W) in Operation, T_C = 54 °C at Steady State
±B supply = ±35 V, 4 Ω Load, 1 kHz audio signal, T_A = 25 °C
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RD-0617
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